<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
//			window.onload = function(){
			document.createElement('header');
			document.createElement('footer');
			document.createElement('article');
//			}
			
		</script>
	</head>
	<body>
		<header>我是头部</header>
		<article>
			我是主要区域
		</article>
		<footer>我是底部</footer>
	</body>
</html>
